[Uncaught Error: The null object does not have a getter '_cursor'.

NoSuchMethodError: method not found: '_cursor'
Receiver: null
Arguments: []
Stack Trace:
#0      Object._noSuchMethod (dart:core-patch/object_patch.dart:42)
#1      Object.noSuchMethod (dart:core-patch/object_patch.dart:45)
#2      Connection._read_response (package:rethinkdb_driver/src/net.dart:267:49)
#3      Connection._read_response (package:rethinkdb_driver/src/net.dart:279:16)
#4      Connection._handleResponse (package:rethinkdb_driver/src/net.dart:107:9)
#5      _rootRunUnary (dart:async/zone.dart:902)
#6      _CustomZone.runUnary (dart:async/zone.dart:804)
#7      _CustomZone.runUnaryGuarded (dart:async/zone.dart:712)
#8      _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341)
#9      _BufferingStreamSubscription._add (dart:async/stream_impl.dart:270)
#10     _StreamController&&_SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:698)
#11     _StreamController._add (dart:async/stream_controller.dart:570)
#12     _StreamController.add (dart:async/stream_controller.dart:516)
#13     _Socket._onData (dart:io-patch/socket_patch.dart:1793)
#14     _rootRunUnary (dart:async/zone.dart:906)
#15     _CustomZone.runUnary (dart:async/zone.dart:804)
#16     _CustomZone.runUnaryGuarded (dart:async/zone.dart:712)
#17     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341)
#18     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:270)
#19     _StreamController&&_SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:698)
#20     _StreamController._add (dart:async/stream_controller.dart:570)
#21     _StreamController.add (dart:async/stream_controller.dart:516)
#22     _RawSocket._RawSocket.<anonymous closure> (dart:io-patch/socket_patch.dart:1344)
#23     _NativeSocket.issueReadEvent.issue (dart:io-patch/socket_patch.dart:728)
#24     _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)
#25     _asyncRunCallback (dart:async/schedule_microtask.dart:48)
#26     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:96)
#27     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:143)
, #0      _rootHandleUncaughtError.<anonymous closure> (dart:async/zone.dart:886)
#1      _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)
#2      _asyncRunCallback (dart:async/schedule_microtask.dart:48)
#3      _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:96)
#4      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:143)
]
in ShutdownIsolate: Unhandled exception:
Uncaught Error: The null object does not have a getter '_cursor'.

NoSuchMethodError: method not found: '_cursor'
Receiver: null
Arguments: []
Stack Trace:
#0      Object._noSuchMethod (dart:core-patch/object_patch.dart:42)
#1      Object.noSuchMethod (dart:core-patch/object_patch.dart:45)
#2      Connection._read_response (package:rethinkdb_driver/src/net.dart:267:49)
#3      Connection._read_response (package:rethinkdb_driver/src/net.dart:279:16)
#4      Connection._handleResponse (package:rethinkdb_driver/src/net.dart:107:9)
#5      _rootRunUnary (dart:async/zone.dart:902)
#6      _CustomZone.runUnary (dart:async/zone.dart:804)
#7      _CustomZone.runUnaryGuarded (dart:async/zone.dart:712)
#8      _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341)
#9      _BufferingStreamSubscription._add (dart:async/stream_impl.dart:270)
#10     _StreamController&&_SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:698)
#11     _StreamController._add (dart:async/stream_controller.dart:570)
#12     _StreamController.add (dart:async/stream_controller.dart:516)
#13     _Socket._onData (dart:io-patch/socket_patch.dart:1793)
#14     _rootRunUnary (dart:async/zone.dart:906)
#15     _CustomZone.runUnary (dart:async/zone.dart:804)
#16     _CustomZone.runUnaryGuarded (dart:async/zone.dart:712)
#17     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341)
#18     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:270)
#19     _StreamController&&_SyncStreamControllerDispatch._sendData (dart:async/stream_controller.dart:698)
#20     _StreamController._add (dart:async/stream_controller.dart:570)
#21     _StreamController.add (dart:async/stream_controller.dart:516)
#22     _RawSocket._RawSocket.<anonymous closure> (dart:io-patch/socket_patch.dart:1344)
#23     _NativeSocket.issueReadEvent.issue (dart:io-patch/socket_patch.dart:728)
#24     _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)
#25     _asyncRunCallback (dart:async/schedule_microtask.dart:48)
#26     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:96)
#27     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:143)

#0      _rootHandleUncaughtError.<anonymous closure> (dart:async/zone.dart:886)
#1      _asyncRunCallbackLoop (dart:async/schedule_microtask.dart:41)
#2      _asyncRunCallback (dart:async/schedule_microtask.dart:48)
#3      _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:96)
#4      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:143)